On 17/05/2010 12:10, Nick Garnett wrote:
Spencer Oliver<[email protected]> writes:
stm32 uart: use 16bit register access
Access all uart register using 16bit access, as per the ST docs.
The ST docs I have, RM0008 version 11 from April 2010, show these
registers as 32 bits wide. The top 16 bits are alway marked as
reserved, so 16 bit accesses should work and the document says "The
peripheral registers can be accessed by half-words (16-bit) or words
(32-bit)." Nothing that requires 16 bit accesses. Given that ST have
left the 32 bit headroom, and that some of the registers are already
using all 16 low order bits, I think it would be a mistake to switch
to 16 bit accesses. Future versions might start using the higher order
bits, and we would just have to switch back.
Was there a specific reason you wanted to use 16 bit accesses rather
than 32 bit?
I was getting a Access Fault when testing, changing to use 16bit access
cured the problem for me.
This was when the Enable Usage, Bus and Mem fault handlers were enabled
in hal_reset_vsr.
Looking at reference code from the stm32lib shows all the accesses as 16bit.
Oh well, just rebuilt all and working fine now :)
Cheers
Spen
